CN103918152A

CN103918152A - Method and system for managing the power of a hybrid vehicle

Info

Publication number: CN103918152A
Application number: CN201280032746.XA
Authority: CN
Inventors: P·卢茨; D·福尼高尔特; D·鲍特罗特
Original assignee: Valeo Systemes de Controle Moteur SAS
Current assignee: Valeo Systemes de Controle Moteur SAS
Priority date: 2011-06-28
Filing date: 2012-06-27
Publication date: 2014-07-09
Anticipated expiration: 2032-06-27
Also published as: US9266524B2; WO2013001233A3; WO2013001233A2; FR2977404B1; US20140129070A1; FR2977404A1; JP6059218B2; JP2014525863A; EP2727211A2; CN103918152B; EP2727211B1; KR20140053146A

Abstract

The invention relates to a method for managing the power of a hybrid vehicle selectively driven by an electric motor and a heat engine, the electric motor being supplied with power by a power storage unit capable of being recharged by the heat engine, wherein according to the method the level of charge of the power storage unit is monitored so as to select the mode in which the vehicle is driven by the heat engine or that in which the vehicle is driven by the electric motor, said method including the steps of: determining a travelling profile of the vehicle associated with a path of said vehicle; and determining (36), according to said travelling profile, a threshold level of charged (S2), referred to as authorised threshold, below which the mode in which the vehicle is driven by the heat engine is activated.

Description

For managing the system and method for hybrid vehicle

Technical field

The present invention relates to a kind of power management method for hybrid vehicle.Also relate to corresponding management system.

Especially especially, the present invention relates to Development of HEV Technology field.

Background technology

Conventionally, hybrid vehicle adopts multiple independent power sources to drive automobile.These power sources generally include the Thermal Motor and the motor that are associated with cell type energy-storage units.

Drive automobile with respect to common independent heat, in hybrid vehicle, exist second power source about to power demand being provided and introducing the additional degree of freedom by the driver of automobile.

Thus, need to find the mode of the various useful sources of a kind of effective employing.Especially, compare with identical conventional automobile, disadvantageous power tube is comprehended and is caused similar or higher power loss, especially due to the excess weight of motor and relative power electronic device, although Hybrid Vehicle is in realizing contrary function.

Have at present the power management method for hybrid vehicle, its permission provides driver's power demand by different power sources, thereby makes the pollutant minimum of current fuel consumption or discharge.

These methods especially need open and/or closed Thermal Motor, and replace the heavy charging and discharging stage of battery.

The optimisation strategy using at present is not considered the actual path being adopted by automobile.Consequent demand may be proved to be to be not suitable for the actual path of automobile.

More particularly, at the moment of distance t place, use the Existing policies for optimizing hybrid vehicle energy budget, to minimize the fuel consume by moment of torsion and the determined instantaneous dynamical system of engine speed working point.But especially the heavily charging of battery, is considered to the restriction of high priority, conventionally mean that used drive pattern is unfavorable for saving loss.

Conventionally,, in existing strategy, the selection in source of driving torque will be shown at the drive condition of moment t, advantageously, pure electric drive power under city driving condition, and advantageously, under special city driving condition, particularly under turnpike driving condition, the power being provided by Thermal Motor.But, determined the selection in driving power source at the battery charge level of moment t.For example, under city driving condition, once battery reaches the charge level of the so-called SOC (charged state) of the maximum discharge level that represents preset and fixing license, open Thermal Motor, so that battery is charged, even if this has increased consumption and pollutant emission.

Lower (approximately 70% the minimum dump energy threshold value) that the maximum discharge level of license arranges conventionally, to prevent long battery discharge in distance, and guarantees best electrical power supply availability.But these low charge levels have minimized possible improvement with respect to the minimizing of disposal of pollutants.

The object of the invention is to improve above-mentioned situation.

Summary of the invention

For this reason, first the present invention relates to a kind of power management method, for driving by motor and Thermal Motor the hybrid vehicle optionally driving, described motor is by providing power for the unit of store electricity power, this unit can heavily be charged by Thermal Motor, monitor in the method the charge level of this power storage unit, to select Thermal Motor or motor drive mode, said method comprising the steps of:

Evaluate the route map of the automobile being associated with the stroke of described automobile; With

-according to described route map, evaluate the threshold value charge level that is called as admission threshold, lower than this admission threshold, Thermal Motor drive pattern is activated.

By consider that stroke route can, using the maximum discharge threshold of license as by the parameter of the stroke carrying out, therefore increase and fall low consumed possibility, manages the danger of the over-discharge can of battery in stroke simultaneously.Preferably, described method comprises if charge level is brought down below admission threshold, the step of asking described Storage Unit heavily to charge, and described heavy charging request comprises the request that Thermal Motor is opened.

Therefore,, from the drive condition of angle the best of fuel consumption and pollutant emission, this memory cell can heavily be charged.

Advantageously, the step of evaluation route map comprises the character of evaluating specifying the stroke between starting point and appointment terminal.

Preferably, the character of stroke is at least from comprising a stroke of special city part (extra urban portion) and not comprising a stroke of special city part and selecting.Special city part is corresponding to through street part that wherein car speed may be higher than predefined threshold speed.

For example, be to distribute the character of stroke is evaluated from the maximal rate of stroke.Particularly, maximum speed distributes and can be made up of the maximal rate of the license running in stroke (such as velocity constraint).Therefore, there is the stroke part higher than 90 kilometers/(even higher than 50 kilometers/hourly) hourly velocity constraint, can be considered to through street part.This VELOCITY DISTRIBUTION is especially provided by map system or GPS (global positioning system) system.

In another example, evaluate the step of route map and comprise and evaluate stroke distances and journey time, and the essence of stroke is to evaluate from the average speed of stroke, described average speed was obtained by described distance and described time.

Particularly, if the average speed of stroke is higher than average speed threshold value, stroke comprises special city part; If average speed is lower than average speed threshold value, stroke does not comprise special city part.Average speed threshold value for example equals 25 kilometers/hour, even 30 kilometers/hour.Advantageously, average speed threshold value is adjustable, and therefore it can be modified.

Advantageously, when stroke comprises special city part, the evaluation of this route map comprises the journey time of evaluating between starting point and the starting point of special city part, the evaluation of admission threshold comprises that described admission threshold is set to the first threshold for this moment, and described admission threshold is set to the Second Threshold higher than described first threshold after this moment.

Preferably, described first threshold is between 20% and 30%.

Second Threshold has guaranteed the electrical power availability of best automobile.Preferably, described Second Threshold is between 60% to 80%.

By adopted lower threshold value before the part of special city, in the time that automobile is arranged in the city stage of stroke, the unlatching of Thermal Motor may be delayed.Therefore, heavily charged at the highway stage of stroke battery, during this stage, this heavy charging has higher integral energy efficiency.Because this one-phase is more effective by Thermal Motor, therefore this further created the highway stroke stage of more optimizing.

In one embodiment, first threshold depends on the journey time between starting point and the starting point of special city part.Therefore the time that, arrival highway spends can be used as the weighting parameters of admission threshold.

Preferably, in the time that stroke does not comprise special city part, admission threshold equals to be more than or equal to the 3rd threshold value of first threshold, and is less than Second Threshold.

Preferably, the 3rd threshold value is between 40% and 50%.

The stroke that does not comprise special city part is the stroke under typical city driving condition, and it preferably provides driving power with motor thus.Open Thermal Motor and will cause consumption and pollutant to increase, wherein catalyst is heating power ground passivity.In the method for prior art, even if battery can support to reach the needed small additional electric discharge in target destination, engine also can be unlocked.Adopt specific to the admission threshold of stroke that does not comprise special city part, allow to increase the license electric discharge of battery.Therefore, avoided the permanent unlatching of excessively doing sth. in advance to Thermal Motor.

Preferably, by their geographical coordinate (especially its GPS and/or map reference) definition starting point and/or terminal.

Preferably, this terminal is inputted by user, normally the driver of automobile.

The invention still further relates to a kind of power management system, for driving by motor and Thermal Motor the hybrid vehicle optionally driving, described motor is by providing power for the unit of store electricity power, and this unit can heavily be charged by Thermal Motor, and described system comprises:

-for monitoring the unit of charge level of power storage unit, to select Thermal Motor or motor drive mode;

-for evaluating the unit of motor road line chart, described route map is associated with the stroke of described automobile;

With

-for evaluating the unit of the threshold value charge level that is called as admission threshold, during lower than this admission threshold, according to described route map, Thermal Motor drive pattern is activated.

Advantageously, this unit that is used for evaluating route map comprises tracking equipment, especially GPS and/or map.

Preferably, described system also comprise for unit, the especially man machine interface of the telex network of automobile.

Accompanying drawing explanation

Referring now to accompanying drawing, non-limiting example of the present invention is described in more detail, wherein:

Fig. 1 shows the schematic diagram of the structure of power management system according to an embodiment of the invention;

Fig. 2 shows according to the flow chart of the step of the power management method of the first variant embodiment of the present invention;

Fig. 3 shows according to the flow chart of the step of the power management method of the second variant embodiment of the present invention;

Fig. 4 shows the figure of the illustrative embodiments of the power management method of prior art; And

Fig. 5 is the figure that the illustrative embodiments of power management method of the present invention is shown.

Embodiment

Fig. 1 shows the power management system 2 for flexible car, and this automobile is for example hybrid vehicle.Preferably onboard system of described management system.

Management system 2 comprises power management block, for example center ECU unit 4.

Power management block 4 is connected to the power drive system of automobile.Described power drive system comprises motor and the engine for front-wheel drive/rear wheel drive is provided, particularly Thermal Motor 6, motor 8 and driving-chain.

Power management block 4 is also connected to power storage unit, and especially battery 10, monitors its charging level.

Preferably, described power management block 4 is connected to man machine interface IHM12, allows the driver 14 of itself and automobile to communicate.

Man-machine interface 12 allows the notified fuel consumption of driver 14, battery 10 charging levels, power cost, CO2 discharge, carbon emission (carbon footprint) etc. thus.

In its terminal, driver 14 can be used for by means of man machine interface's 12 inputs the information of power management block 4.

According to preferred embodiment, management system 2 also comprises the gps system that is connected to described power management block 4, maybe can evaluate from the map system 16 of the route of origin-to-destination.

It should be noted that, in the time that evaluation is called as the license charge threshold level of battery 10, described power management block 4 can be considered the route map that driver 14 inputs via man-machine interface 12 and/or exported by gps system or drafting system 16, during lower than this threshold level, Thermal Motor 6 drive patterns must be activated.

This route map is for example by its geographical coordinate, and especially the character of stroke distances, journey time and the stroke between the determined starting point of its gps coordinate and terminal is determined.

The position of starting point during corresponding to automobile starting, terminal is corresponding to the position of the destination of this automobile.This terminal can be inputted via man-machine interface 12 by driver 14.

Fig. 3 is the flow chart that operation the inventive method is shown, when route map is corresponding to stroke UE, the trip comprises the city part PU that follows special city part PE below, and this special city part is through street part, such as highway part.

In Fig. 4 and Fig. 5, the VELOCITY DISTRIBUTION being associated with stroke UE is shown by curve 50.

Curve 50 has comprised the city part PU of time span between 600 to 850 seconds, and special city part PE comprises the time span between 850 to 1200 seconds.

This VELOCITY DISTRIBUTION shows, this automobile is frequently parked in the city part PU of stroke, for example, at moment t3, t4 and t5.Automobile is no more than 50 kilometers/hour in the maximum speed of this city part.

In special city part PE, automobile does not stop, and its speed is never brought down below 50 kilometers/hour.

For example, the character of this trip is compared and determined by the average speed Vmoy of average speed threshold value Vseuil and stroke.

Average speed threshold value Vseuil can be determined by " maximum " time of the typical case at city driving condition down stroke and typical case's " maximum " distance.Maximum time preferably equals 35 minutes.Ultimate range is preferably included between 15 to 18 kms.These values cause average speed threshold value Vseuil on stroke between 25 to 30 kilometers/hour, may prove to have adopted pure electric drive mode.

In step 60, driver 14 is by the journey time t input people of stroke UE machine interface 12.They go back the stroke distances d of input travel UE.By way of example, the distance d of stroke UE equals 15 kilometers, and time t is approximately 12 minutes.

As variant, this information can directly be exported from gps system and/or map system 16, and directly sends to power management block 4.

In step 62, administrative unit 4 is evaluated the average speed Vmoy of the trip, be herein average travel speed Vmoy be 75 kilometers/per hour, and itself and average speed threshold value Vseuil are compared.

In step 64, administrative unit 4 determines that average speed Vmoy is much higher than the threshold value of 30 kilometers/hour.Therefore, in stroke UE, there is special city part.

In step 65, administrative unit 4 is evaluated the journey time △ t between starting point and the starting point of special city part PE.

In step 66, this administrative unit 4 determines then, the license charge threshold level of the stroke carrying out is equaled to 20 to 30% first threshold S1 for the time △ t under city driving condition PU, and after time △ t, equal 60% to 80% Second Threshold S2.Therefore, administrative unit 4 is configured to use motor 8 to postpone to use Thermal Motor 6 by preferring to during the time △ t before arriving super expressway.

Administrative unit 4 is also configured to, once reach Second Threshold S2, whether determines (at △ t+1 place) startup Thermal Motor 6 after time △ t.Therefore,, at the special lasting time durations of city part PE, if needed, battery 10 can heavily be charged.

This Second Threshold S2 preferably has the value of the availability of guaranteeing best electrical power supply.In the strategy of prior art, once the charge level of battery 10 drops to lower than this threshold value S2, Thermal Motor 6 is started, thus no matter any journey time and/or distance, and battery 10 can heavily be charged.

Curve 70 in Fig. 4 shows after automobile starting, and Thermal Motor is switched in a short period of time.In this case, the operating condition of Thermal Motor 6 is undesirable, because it is by cold start-up in the stroke of city.This can cause extra fuel consumption and pollution.

On the contrary, in the time that method of the present invention is used for arranging this first threshold S1 lower than Second Threshold S2, even if the charge level of battery is brought down below Second Threshold S2, battery 10 is not heavily charged during the time △ t between beginning and the starting point of special city part PE yet.This is will more favourable route condition to occur because management system of the present invention is known, i.e. special city part PE, and therefore this heavy charging is delayed.

Therefore,, as shown in curve 74, battery 10 is heavily charged during special city part PE.This makes to become possibility about the optimum efficiency of the Thermal Motor 6 of pollutant emission.

Fig. 2 is the flow chart that the example of the operation of method of the present invention is shown, now route map, corresponding to unique city stroke U, does not comprise the stroke of special city part PE.

Exemplarily, the character of this trip is by the average speed threshold value of the average speed of stroke and 30 kilometers/hour is compared and determined.

In step 30, driver 14 is by the time t input man machine interface 12 of stroke U.They go back the distance d of input travel U.This information is sent to power management block 4.

As variant, this information can directly be exported by gps system and/or map system 16, and is directly sent to power management block 4.

In step 32, administrative unit 4 is calculated the average travel speed Vmoy of automobile by distance d and the time t of stroke, and itself and average speed threshold value Vseuil are compared.

In step 34, administrative unit 4 (being ECU in this example) determines that average speed Vmoy is lower than general threshold speed Vseuil, and therefore, this trip U does not comprise special city part PE.

Then,, in step 36, administrative unit 4 is for the stroke carrying out is set as the minimum charge level of battery 10 greater than or equal to first threshold S1 and lower than the 3rd threshold value S3 of Second Threshold S2.For example, the 3rd threshold value S3 is between 40% and 50%.Therefore, therefore this system is configured to by using motor 8 to postpone use Thermal Motor 6 when the charge level of battery 10 prefers to during higher than the 3rd threshold value S3.In the trip, monitor constantly charge level, and itself and the 3rd threshold value S3 are compared.

Preferably, the 3rd threshold value S3 is higher than the first threshold S1 using in the △ t time in the stroke with special city part PE.This is because comprising in the stroke of special city part PE, know this special city part PE and can support the larger electric discharge to this battery 10 by allowing battery 10 heavily to charge.

The 3rd threshold value S3 is lower than the admission threshold S2 of the assurance optimum electrical power supply availability using in the prior art, and this admission threshold S2 is between 60% to 80%.

In the strategy of prior art, once the charge level of battery is lower than admission threshold S2, Thermal Motor is unlocked, to heavily charge for battery 10, regardless of the character of stroke, no matter be for the stroke that comprises special city part PE or do not comprise the stroke of special city part PE.

By way of example, the distance of stroke U is equal to or less than 2 kilometers, and for the average speed of 24 kilometers/hour, its time is about 4.5 minutes.Illustrate that by the curve 20 in Fig. 4 and Fig. 5 the exemplary speed being associated with city stroke U distributes.

This VELOCITY DISTRIBUTION shows automobile and frequently stops, for example, and at moment t1 and t2.The maximal rate of automobile in the trip is no more than 50 kilometers/hour

Curve 40 in Fig. 4 shows before vehicle is reached home, and Thermal Motor 6 is unlocked on the very short time (approximately one minute).In this case, activation heat force engine 6 is very disadvantageous for fuel consumption and pollutant emission.In addition, because journey time is too short, battery 10 is not charged completely.

On the contrary, in the time that method of the present invention is used to arrange lower than the 3rd threshold value S3 of Second Threshold S2, stroke is to carry out for 8 times at motor completely, even if the charge level of battery 10 drops to lower than Second Threshold S2, thereby reduces to greatest extent the discharge of pollutant.Battery 10 is also likely heavily charged (curve 42) by being connected to main electrical network in final destination, if this is possible technically, or ought in follow-up stroke, heavily be charged if desired.

Claims

1. the power management method for hybrid vehicle, described hybrid vehicle is optionally driven by motor (8) or Thermal Motor (6), described motor (8) provides power by electrical power memory cell (10), described electrical power memory cell (10) can be by described Thermal Motor (6) recharge, in described method, monitor the charge level of described electrical power memory cell (10), to select Thermal Motor (6) drive pattern or motor (8) drive pattern, described method comprises the steps:

The route map of the automobile that-evaluation is associated with the stroke of described automobile; With

-according to described route map, evaluate the threshold value charge level (S1, S2, S3) that (36,66) are called as admission threshold, lower than described admission threshold, described Thermal Motor (6) drive pattern is activated.

2. method according to claim 1, wherein said method comprises if charge level is brought down below described admission threshold (S1, S2, S3), the step of asking described electrical power memory cell (10) heavily to be charged, described heavy charging request comprises the request that described Thermal Motor (6) is opened.

3. according to the method described in any one in claim 1 and 2, the step of the described route map of wherein said evaluation comprises evaluation (30,32) appointment starting point and specifies the character of stroke distances (d), journey time (t) and stroke between terminal.

4. method according to claim 3, the character of wherein said stroke is at least from comprising a stroke of special city part (PE) and not comprising a stroke of special city part (PE) and selecting.

5. method according to claim 4, is wherein evaluated the character of described stroke by the VELOCITY DISTRIBUTION of described stroke.

6. method according to claim 4, the step of wherein evaluating described route map comprises the described stroke distances of evaluation (30) (d) and described journey time (t), and evaluated the character of (32) described stroke by the average speed (Vmoy) of described stroke, described average speed (Vmoy) was obtained by described distance (d) and described time (t).

7. method according to claim 6, wherein, if the described average speed (Vmoy) of described stroke higher than average speed threshold value (Vseuil), described stroke comprises special city part (PE); And

If described average speed (Vmoy) is lower than described average speed threshold value (Vseuil), described stroke does not comprise special city part (PE).

8. according to the method described in any one in claim 4 to 7, wherein, in the time that described stroke comprises special city part (PE), the step of evaluating described route map comprises journey time between the described starting point of evaluation (65) and the starting point of described special city part (PE), and (△ t)

Evaluate (66) described admission threshold, comprise and set described admission threshold for for (△ first threshold (S1) t), and (△ t) sets described admission threshold afterwards for higher than the Second Threshold (S2) of described first threshold (S1) in the described time of described time.

9. method according to claim 8, wherein, described first threshold (S1) is between 20% to 30%.

10. the method described in any one according to Claim 8 with 9, wherein, described Second Threshold (S2) is between 60% to 80%.

Method in 11. according to Claim 8 to 10 described in any one, wherein, in the time that described stroke does not comprise special city part (PE), described admission threshold equals the 3rd threshold value (S3), and described the 3rd threshold value (S3) is greater than or equal to described first threshold (S1) and lower than described Second Threshold (S2).

12. methods according to claim 11, wherein, described the 3rd threshold value (S3) is between 40% to 50%.

13. according to the method described in any one in claim 3 to 12, and wherein said starting point and/or described terminal are limited by its geographical coordinate, are especially limited by its gps coordinate.

14. methods according to claim 13, wherein, described terminal is inputted by user (14).

15. 1 kinds of power management systems (2), for the hybrid vehicle optionally being driven by motor (8) and Thermal Motor (6), described motor (8) provides power by electrical power memory cell (10), described electrical power memory cell (10) can heavily be charged by described Thermal Motor (6), and described system (2) comprising:

-for monitoring the unit of charge level of described electrical power memory cell (10), to select Thermal Motor (6) drive pattern or motor (8) drive pattern;

-for evaluating the unit of the motor road line chart being associated with the stroke of described automobile; With

-for evaluating the unit of the threshold value charge level (S1, S2, S3) that is called as admission threshold, during lower than this admission threshold, according to described route map, Thermal Motor (6) drive pattern is activated.

16. systems according to claim 15, wherein, this unit that is used for evaluating route map comprises tracing equipment (16), especially GPS and/or map.

17. according to the system described in any one in claim 15 and 16, and it also comprises unit, especially man-machine interface (12) for communicating with the user of automobile.